Native Soil by Phaedra Weldon (Revenants)

Previously titled just Native Soil, this is now part one of a larger work and no longer contains the short story, Ghoul, which is now available separately.

Jason Lawrence died over seventy years ago, the day he invited the demon Mephistopheles into his body. And from that day he's lived as one of the First Born, a Revenant. A vampire. Revenants can only be made by taking in a demon (First Born) into their body and surrendering a part of their souls to be forever bound to the blood of humans.

Rene's revenge against Jason was swift and merciless. Changing his lover into a Lamia and turning her lose on an unsuspecting population guarantees Jason must find her, and ultimately destroy her. But will he succeed before she kills and is hunted down by the local law as well as a shadow society intent on capturing her for their own nefarious purposes?